Friction-grip mechanism.



Nmraomw.

E. STANCLIFF.

PATENTED 00T. 1o, 1905.

FRIGTION GRIP MECIII-NISM.l

APPLICATION FILED MA. l. 1905.

MtneSSeS: i y

Inventor,

NITED STATES PATENT ornron.

FRlCTlON-GRIP IVIECHANISIVI.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed March l, 1905. Serial No. 247,906.

T0 @ZZ whom, t may concern.'

Beit known that I, EDwIN STANCLIFF, a citi- Zen of the United States ofAmerica, and a resident of the city,county,and State of New York, haveinvented certain new and useful Improvements in Friction-Grip Mechanism,of which the following is a specification.

This invention is an improvement upon the invention disclosed in myprior patents, N o. 514,570, dated February 13, 1894, for a nutlockingbolt; No. 514,571, dated February 13, 1894, for friction-grip mechanism;No. 537,244, dated April 9, 1895, for nut-locking bolt, and No. 577,521,dated February 23, 1897, for nut-locking bolt, in each of which a shaftis transversely cut or notched by a flat-bottomed notch or cut, with oneside of the notch or cut further cut away to form a rocking edge, and arocking piece is fitted into the notch to make the shaft complete.

The object of this invention is to make a semicylindrical cuttransversely across the shaft in lieu of the forms of cuts disclosed inthe above-mentioned patents, whereby the cutting of the notch can beeffected in a less expensive manner by means of a rotary tool,

vas a suitably-guided drill.

A further object of the invention is to form the rocking edge with afurther cutting away by a conical surface or other surface of rotationhaving the same axis as the semicylindrical surface forming the mainportion of the notch, whereby the forming of both the main portion ofthe notch and the cut-away portion may be concurrently effected by thesame tool.

A further object of the invention is to form a notch with thecylindrical surface of the same diameter as the outside of the shafttaken at the bearing-surface of the rocking piece, whereby the rockingpiece is reversible, so that less care need b'e exercised in assemblingthe parts.

My invention is applicable in various devices, such as are illustratedin my prior patents above enumerated; but one of its principalapplications is to nut-locking bolts, in connection with which it isherein specifically illustrated in the accompanying sheet of drawings,which forms a part of this application, in which Figure 1 is anelevation ofa nut-locking bolt embodying my invention With the nut shownin section. Fig. 2 is a transverse section through the bolt and nut onthe line II II of Fig. 1. Fig. 3 is a separate view of the rockingpiece. Fig. 4 is a modified rocking piece without thread. Fig. 5 is atop view of a jig in which the bolts are inserted for notching. Fig. 6is a side view of the jig, together with a counterboring-drill forforming the semicylindrical notch and the conical cut-away portion. l

A bolt, the body portion of which, 1, carries the head and thread in theusual manner, is notched transversely through the threaded portion witha semicylindrical cut c c, and one end of the notch is further cut awayto a conical surface a the cylindrical and conical surfaces meeting at aand forming a rocking edge at a point eccentric to the axis of the bolt.A rocking piece 2 is fitted into the notch, so as to make the boltcomplete, except for the conical cut-away portion, and the rocking edgelies in the general longitudinal direction of the bolt at the point atwhich the rocking piece bears and about which the rocking piece wouldtend to rock when an attempt is made to unscrew the nut 3.

The notch in the bolt, including the cutaway portion, is formed byplacing the bolt in a jig 4, as illustrated in Figs. 5 and 6, provisionbeing made for the insertion of two bolts and simultaneous operation onboth. The cutting is effected by a counterboringdrill 5 of properdiameter at the tip l for forming the main portion of the notch andhaving a conical counterbore portion e for forming the cut-away portionof the notch.

The rocking piece is preferably a casting or forging of the finishedsize, so that it does not require to be machined. If a rocking 'piecewith a smooth instead of threaded face is used, the notch is preferablymade of the same curvature as the face, so that the rocking piece may beplaced in the notch either' side up.

Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a friction-grip mechanism, a shaft formed with a semicylindricalnotch transversely across one side of the shaft, and a rocking piecefitting into the notch to make the shaft complete, one of the partsbeing cut away to form a longitudinal rocking edge so positioned that ifthe rocking piece is rocked in one direction the combined diameter ofthe rocking piece and shaft is increased beyond their combined diameterwhen the parts are rocked upon this edge in the other direction,substantially as described.

2. In a friction-grip mechanism, a shaft IOO IIO

formed with a semicylindrical notch transversely across one side ot' theshaft, which notch is cut away at one end by a surface having the sameaXis as the notch to form a longitudinal rocking edge, and a rockingpiece iitting into the notch to make the shaft complete except at thecut-away portion of the notch, the longitudinal rocking edge being sopositioned, that if the rocking piece is rocked in one direction thecombined diameter of the rocking piece and shaft is increased beyondtheir combined diameter when the rocking piece is rocked upon this Aedgein the other direction, substantially as described.

8. ln alfriction-grip mechanism, a shaft formed with a semicylindricalnotch transversely across one side of the shaft, which is cut away toforma longitudinal rocking edge, and a rocking piece both sides of whichhave the same amount of curvature and itting into the notch,substantially as described.

Il. A nut-locking bolt formed with a semicylindrical notch transverselyacross one side of the shaft, which notch is cut away to form alongitudinal rocking edge, the cylindrical portion of the notch havingthe same diameter as the bottom of the thread, and an unthreaded rockingpiece iitting into the notch, the outwardly-facing surface of therocking piece being a cylindrical surface ot' the diameter at the bottomot' the thread ot' the bolt, substantially as described.

Signed by me at New York city, New York, this 28th day of February,1905.

EDWIN STANCLIFF.

l/Vitnesses:

SAMUEL W. BALoH, HY. H. WHITMAN.

